ILFORD ILFOSOL 3 DEVELOPER black and white film developer is an enhanced formulation of the one-shot, general-purpose, liquid black and white film developer – ILFOSOL S. The new developer is particularly suited for use with medium and slow speed films such as PAN F PLUS, FP4 PLUS and DELTA 100 PROFESSIONAL where it ensures a fine grain and optimal sharpness at full film speed. It is supplied as a concentrate in economical 500ml bottles and is diluted (typically at a ratio of 1:9) for one-shot use. However, for greater economy, ILFOSOL 3 can also be used with many films at a higher dilution of 1:14 with only a small trade off in image quality. 500ml.